What a share represents, how prices move, and the basic order types you'll use.
A share of stock is a small piece of ownership in a company. When you buy one share of Apple, you own a tiny fraction of Apple — its profits, its assets, and (in theory) a vote at shareholder meetings.
Stock prices move based on supply and demand: more buyers than sellers pushes the price up, more sellers than buyers pushes it down. Behind that supply/demand shift is usually news — earnings reports, product launches, economic data, or just shifting sentiment about the future.
Two numbers matter most when you're starting out: the current price (what it costs right now) and market cap (price × total shares outstanding, which tells you the company's total value). A $50 stock isn't automatically 'cheaper' than a $500 stock — it depends entirely on how many shares exist.
Order types you'll actually use as a beginner:
The single biggest beginner mistake is treating a stock's price chart like a video game score. A falling price doesn't mean 'buy the dip' automatically, and a rising price doesn't mean 'take profit now' automatically — both require understanding *why* the price is moving before you act.
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